[Crash-utility] [PATCH] fix output bug of trace.c

[Dave Anderson]

----- Original Message -----
> Hello Dave,
> 
> The patch is used to fix the output of trace.c.
> 
> When I was using trace command to display function tracer's data. The
> following information is displayed.
> 
> <cut>
> crash> trace show
> version = 6
> cpus=2
>            <idle>-0     [001] 20067.827943: function: 0xffffffff81089fa40xffffffff8109e423
>            <idle>-0     [001] 20067.827944: function: 0xffffffff811115a40xffffffff8109e4cd
>            <idle>-0     [001] 20067.827944: function: 0xffffffff81097a140xffffffff8109e44f
>            <idle>-0     [001] 20067.827945: function: 0xffffffff81089fa40xffffffff8109e479
>            <idle>-0     [001] 20067.827945: function: 0xffffffff81089fa40xffffffff8109e482
> ...
> <cut>
> 
> In tmp_fprintf, function snprintf is used to output data. However, if
> the following situation happends, the last character is omitted which
> causes the above bug.
> 
> <cut>
> snprintf(buf, 10, "123456789\n"); /* '\n' is omitted */
> <cut>
> 
> With the patch, the output is like below.
> 
> <cut>
> crash> trace show
> version = 6
> cpus=2
>            <idle>-0     [001] 20067.827943: function: debug_lockdep_rcu_enabled <-- walk_tg_tree_from
>            <idle>-0     [001] 20067.827944: function: rcu_is_cpu_idle <-- walk_tg_tree_from
>            <idle>-0     [001] 20067.827944: function: tg_nop <-- walk_tg_tree_from
>            <idle>-0     [001] 20067.827945: function: debug_lockdep_rcu_enabled <-- walk_tg_tree_from
>            <idle>-0     [001] 20067.827945: function: debug_lockdep_rcu_enabled <-- walk_tg_tree_from
> ...
> <cut>
> 
> --
> --
> Regards
> Qiao Nuohan

Hello Qiao,

Because the trace.c file is included in the crash source tree as 
a reference extension module file, it is queued for crash-6.1.1.

Thanks,
  Dave